ARM: dts: rockchip: enable thermal on rk3288-evb board

When a thermal temperature is invoked use the CRU to reset the chip
on rk3288-evb boards. TSHUT is low active on these boards.

Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>